Canadian superstar Justin Bieber has been slammed for his "disgusting" behaviour after turning up two hours late for his opening night at London's O2 Arena.

The 'Baby' singer's terribly late arrival saw hundreds of his fans walk-out of the venue despite waiting hours for his turn on the stage.

Bieber, 19, appeared in front of the audience at 10.35pm - just 25 minutes before his sell-out concert was due to finish.

The star has many young fans who were forced to leave early and  Twitter was ablaze with angry parents after the show.

One user angrily posted: "@justinbieber: Good day” well it was until you were 2 hours late and we ended up missing you as we had to get the train #wasteoftime &money.

He added: "discusting!! Waste of my time and money...never again (sic).'

Former Coronation Street actress Wendi Peters tweeted: "I shall have an extremely moody daughter tomorrow .. Livid (sic)."

Mother Emma Harman, from Kent, told Sky News she was "disgusted" after her husband had been left waiting with their nine-year-old daughter.

She said: "I am hoping he will be ashamed of his behaviour, but I very much doubt it. My husband has left now having seen three songs."

Joanne Dorken of MTV News tweeted: "Literally kids in tears on the tube after parents made them leave to get last trains! Heartbreaking stuff :( (sic)."

The 02 apologised for Beiber's late arrival, but did not give a reason for the star's delay.

Posting on Twitter, the message read: "Justin Bieber is now on stage and apologises for the lateness of his show. Sorry to all the Justin Bieber fans for the lateness of his show tonight. The Tube will still be running when the show finishes (sic)."

Earlier in the day, Bieber tweeted about his sunny state of mind, writing: "In a good mood. Got my friends and team with me here and ready for Day 1 at the O2. London get ready! #BELIEVEtour (sic)." Watch Bieber perform live on a UK TV show here: